OCaml and static linking (was old thread: Re: [Fedora-packaging] Issues with Ocaml and Static Linking)
Richard W.M. Jones
rjones at redhat.com
Mon May 21 08:49:56 UTC 2007
David Woodhouse wrote:
> On Sat, 2007-05-19 at 17:36 +0100, Richard W.M. Jones wrote:
>> I suspect it's unlikely that upstream will do (a), ever. There's a
>> technical issue. OCaml really doesn't have a concept of an ABI. It
>> does a kind of whole-program optimisation where even changes to the
>> internal implementation of a library can affect the resulting binary.
>> Moreover even if you "fixed" that, any change whatsoever to the
>> library's signature or the version of compiler it was built with (even
>> bugfix releases which have the same version number) will make the
>> library incompatible.
> Our current package scheme doesn't handle this at all, does it? Should
> our ocaml-*-devel packages have runtime Requires: on the precise n-v-r
> of ocaml used to build them?
Yes definitely. In fact any other behaviour is broken. (All packages
should have this Requires -- I'm not sure why you elected for just the
-devel packages). Furthermore, if one library or program depends on
another library, then it must contain a dependency on the precise n-v-r
of the library.
The only reason I didn't do it for the four packages I just put up for
review is that I couldn't work out _how_ to do it in the spec file :-(
[My packages for review: http://tinyurl.com/2rl4w6]
Requires: ocaml = 3.09.3-1
Requires: ocaml = 3.09.3-1
Requires: ocaml-pcre = 5.11.4-1, ocaml-extlib = 1.5-1, ocaml = 3.09.3-1
The final package requires the precise versions of the two libraries it
was built against, plus the precise version of OCaml that it was built
I don't know how well this will interact with the Fedora build system.
For instance if a new version of a fairly fundamental library (eg. ocaml
itself, or something like ocaml-pcre) is released, everything which
depends on that has to be recompiled. This is something of a perpetual
problem for the Debian folks.
At one point I remember that OCaml in Ubuntu was really broken,
apparently because they'd taken packages from upstream Debian half way
through a transition like this, so some packages were compiled against
one version of ocaml-pcre, and others against another version, with the
result that you couldn't use certain combinations of libraries if the
libraries depended on different ocaml-pcre.
Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/
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